Compound engine



(No Model.) 3 Sheets-Sheet 1.

W. H. DONALDSON.

COMPOUND ENGINE.

No. 333,507. n Pate'ned Jan. 5, 1886.

WHnM/sws. dJcLowen.

N. FUERS Hula-Lithographer Walhinglan. D. C.

(No Model.) 4 s Sheets-Sheet 2;

W. H. DONALDSON. COMPOUND ENGINE.

No. 333,507. Patented Janus 1886.

wdlllnmu N4 PEIERS, Phmo-Lhhogmpher, Wnshinglon, D-C.

(No Model.) 3 Sheets-Sheet 3.

W. H. DONALDS ON.

COMPQUND ENGINE.

No. 333,507. Patented Jan..5, 1886.

Jnvnlfbr.

as an N. PETERS. PhflQ-Lithogqphcr, Washington. 0..

UNITED STATES PATENT OFFIC i WALTER HALLOVELL DONALDSON, OF SAN FRANCISCO, CALIFORNIA.

COMPOUND ENGINE.

EPPCIFICATION forming part Of Letters Patent No. 333,507, dated January 5, 1886.

Application filed March 31, 1885. Serial No.160,829. (No model.)

To aZZ whom it may concern.-

Be it known that I, WALTER HALLOWELL DONALDSON, a resident of San Francisco, Stateof California, haveinvented anovel and useful Compound Engine; and I hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings.

.gine, showing high-pressure valve.

My invention relates toa novel construction of aconipound engine having an intermediate reciprocating high-pressure cylinder, long connectingrods, and only one gland.

The following description fully explains the nature of my saidinvention and the mannor in which I proceed to construct, apply, and operate the same, the accompanying drawings being referred to by figures and letters.

Figure 1 represents a vertical section through center of engine, showing the engine on halfstroke. Fig. 2 is a plan view of the intermediate valve. Fig. 3 represents an elevation of connecting-rod. Fig. 4 is a plan view of. en-

Fig. 5 represents a vertical section of engine in line of crank-shaft, showing engine on top center. Fig. 6 is a plan view of exhaust-valve. Fig. 7 is a plan view of high-pressure valve. Fig. 8 is a plan view of engine. Fig. 9 represents a cross-section of high-pressure cylinder and low-pressure piston, showing the connectingrods and branch lubricating-pipes. Fig. 10 represents a section of high-pressure cylinder and low-pressure piston, showing device for lubricating wrist-pins. Fig. llis a plan view of low-pressure piston, showing branch pipes for lubricating wrist-pins.

Referring to Fig. l, the stationary highpressure piston is marked a; high-pressure cylinder and low-pressure piston, cast in one piece, I); low-pressure cylinder, 0, bolted to base. Water-tight crank-case is marked din squarebaseofengine-frame;connecting-rods,e; high-pressure-cylinder valve, f; intermediate valve, 9; exhaust-valve,h; high-pressure-valve stem, '5,- square steel valve'stem, 13 bevel g wheels, j; stuffing-box and gland, j steel bushing, k, annular chamber, at; pipe to condenser oratmosphere, n,- steamsupply pipe, 0,- auxiliary valve, p,- wrist-pins for connectingrods, q,- working-barrel, r, and stationary plunger, s, of lubricating-pump; oil discharge branch pipes, t,- man-hole plate, y, and crankcase or square base of engine-frame disks, 2.

Referring to Fig. 2, the intermediate valve is marked 9, and square hole in same Z.

Referring to Fig. 3, the connecting-rods are marked 6.

Referring to Fig. 4, the high-pressure cylinder-valve is markedf, and square hole in same Z.

Referring to Fig. 5, the stationary highpressnre piston is marked a,- high-pressure cylinder and low-pressure piston, in one piece, b,- lowpressure cylinder, 0, bolted to base; watertight crank-case, d; connecting-rod, e; high-pressure-cylinder valve, f; intermediate valve, g,- exhaust-valve, h; high-pressure-valve stem, t,- square steel valve-stem, Z bevel gear- Wheels, j; stuffing-box and gland, j,- steel bushing, l6, square hole in valves, Z; annular chamber, m; Wrist-pins forconnecting-rods, q; working-barrel, r; and stationary plunger of lubricating pump, 8; oildischarge branch pipes. t, and crankcase disks, 2.

Referring to Fig. 6, the exhaust-valve'is marked h, and square hole in same Z.

Referring to Fig. 7, the high-pressure-cylinder valve is marked f, and square hole in same Z.

Referring to Fig. 8,the crank-case disks are marked 2.

Referring to Fig. 9,the high-pressure cylinder and low-pressure piston, in one piece, is marked 12; wrist-pins for connecting-rods, q'; working-barreloflubricating-pump,r; oil-discharge branch pipes, t, and oil-holes in upper end of connecting-rods, u.

Referring to Fig. 10,the high-pressure cylinder and low-pressure piston, in one piece, is marked b,- connecting-rods, e,- water-tight crank-case,d,- working-barrehr, and stationary plunger of lubricating-pump,s; oil-discharge branch pipes,t; oil-holes in upper end of connecting-rods,u; suction-openings for oil in lubricating-pump, r; ball-valves, w, and valveseats,ac,in working-barrel, and stationary plunger oflubricating-puinp and man-hole plate,g

Referring to Fig. 11, the highpressure cylinder and low-pressure piston, in one piece,is marked, b,- oil-discharge branch pipes, 25, and oil-holes in upper end of connecting-rods, u. The high-pressure piston a is stationary,being cast with or bolted to a base. The high-presst the holes I in the valves.

65 ure piston a.

are cylinder and low-pressure piston are cast in one piece,b, and the low-pressure cylinder '0 is bolted to a base, as shown. The base of the engine column or frame is a water-tight 5 crank-case, d, and affords a means for 1ubrieating the cranks and val ve-gear. The motion of the low-pressure piston is transmitted to the cranks by means of two connecting-rods, e. There'are three valvesnamely, the hi ghlO pressure, f, intermediate, and exhaust, h.

These valves are metal diskswith radial openings of suitable size, revolving against the piston heads or followers, the heads or followers having openings cut in them corresponding to The valves are held to their places by steam-pressure on the under side. Motion is imparted to the high-pressure valvef by bevel gear-wheelsj, the one attached on the lower end of the valve-stem t engaging with one of equal diameter on the drivingshal't. The wrist-pins q of the upper ends of the connecting rods are lubricated by a device shown in Fig. 10, consisting of a pump, made of brass or other metallic tubing, one tube forming a stationary plunger,

8, secured to the crank-case d, the other tube fitting it closely and forming the working-barrel r of the pump. The stationary tube or plunger has openings 2) at its base, for

the admission of the oil and water, by which it is surrounded, and at the upper end of the tube there is a ball-valve, w, made of metal or rubber, and a valve-seat, or. The other tube or working-barrel is tapped into the low- 5 pressure piston, and is provided with two branch pipes, t, leading to points directly above the oil-holes a, in the connecting-rod heads. This tube is also provided with a ball-valve, w, and valve-seat :0. I dispense 0 with stuffing-boxes and glands, only one,

j, being employed in my compound engine, thereby greatly reducing friction and avoiding the time and expense required to adjust and keep them in condition. The stem 1; of

the high-pressure valvef is formed of steel tubing with a steel bushing, 7c, welded into the top end, having a square hole in it. The intermediate valve, 9, has a stem of square section running freely into the steel bushing,

0 permitting a vertical motion, and at the same k. The exhaust-valve opens into an annular chamber, m, on top of the low-pressure cylinder, and thence by the pipe n to the condenser or to the atmosphere. Steam is supplied by the supply-pipe 0 to the stationary high-press- It is also introduced into the low-pressure cylinder 0 from the supply-pipe by an auxiliary valve, 1), which is to be used only when the engine is brought to a stop on the downstroke. As the high-pressure valve f is only open on the upstroke, it is necessary to admit enough live steam on top of the lowpressure piston b to start it on the downstroke, when the regular motion of the valves will take place. The crank-shaft boxes are cast to disks 2, which are bolted to the crankcase (I. In the crank-case there is a man-hole covered with a plate, y.

The operation of the lubricating device is as follows: The upstroke of the low-pressure piston draws the working-barrel r of the pump up a distance equal to the stroke of the engine, creating a vacuum, into which the oil and water rise through the valve-opening. On the downstroke the valve to seats, and the water and oil are forced outward into the branch pipes t, and thence through the openings over the oil-holes u of the connecting-rod.

Having thus fully described my invention,

.what I claim, and desire to secure by Letters Patent, is-

1. In a compound engine, the combination, with the stationary low-pressure cylinder and the stationary high-pressure piston, of the portion 1), forming both the low'pressure piston and the high-pressure cylinder, lying and working between the two first-named parts,

and provided with connections for the rods 6,

substantially as set forth.

2. In a compound engine, the combination, with the stationary high-pressure piston, combined reciprocating high-pressure cylinder and low-pressure cylinder, and the stationary low-pressure cylinder, of the rotating highpressure valvef, located in high-pressure piston, rotating intermediate valve, 5;. in the combined cylinder and piston, and the rotating exhaust-valve h in the low-pressu re cylinder, and means, substantially as described, for imparting a rotary motion to said valves, as set forth.

3. In a compound engine, the combination, with the two pistons and cylinders, as de scribed, of the valves f, g, and h, located as shown and described, and the shaft 2', and suitable gearing for rotating valvef, and non-circular spindle i", for rotating valvesg and h, connected with shaft 6, as set forth.

4. The combination, with the water-tight crank-case, of a pump having the tube or stationary plunger 8 and the tube or workingbarrel r, both of said tubes being provided with ball-valves and valve-seats, as set forth. 5. The combination, with the water-tight crank-case, of a pump connected to a reciprocating' part of the engine, whereby lubricant may be drawn from the case to the working parts of the engine, as set forth.

In testimony whereof I have hereunto set my hand and seal. I TALTER ALLOWELL [I]. 5.] Vitnesses:

A. B. SMITH, FERDINAND IMHORST, PHINEAS SPRAGUE. 

